Females will have blue speckling across their whole body, males just on the face.

In 1978 Moyer and Nakazono showed Centropyge interruptus to be a protogynous hermaphrodite - in other words, they enter the world without a sex. As they mature, they first take on the female sex organs. Similar to other protogynous hermaphrodites, the male is the result of a dominant female that has undergone a sex change due largely to a male that has either died or disappeared in some manner.[2]